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- Milberg, Per, et al.
(författare)
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Is spring burning a viable management tool for species-rich grasslands?
- 2014
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Ingår i: Applied Vegetation Science. - : Wiley-Blackwell. - 1402-2001 .- 1654-109X. ; 17:3, s. 429-441
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Tidskriftsartikel (refereegranskat)abstract
- QuestionThe management of species-rich semi-natural grasslands, a fragmented and threatened vegetation type in Europe, involves costs. Mowing is expensive and grazing can be difficult to achieve and maintain for logistical reasons. Is annual spring burning, which is potentially cheaper than mowing and grazing, a viable management tool for species-rich grasslands?LocationLong-term field trials in 11 grasslands in southern Sweden.MethodsWe calculated the odds for a species being an indicator of good management, an indicator of poor management, or an indicator of nitrogen influence in spring-burned plots, grazed plots and annually mowed plots. Odds ratios contrasting spring-burned plots with grazed plots and spring-burned plots with mowed plots were subjected to meta-analyses in which we compared the odds ratios after 1, 8 and 14 spring burns. For a single trial, we also analysed data after 1, 8, 14, 28 and 39 spring burns.ResultsCompared with mowed and grazed plots, the odds of the four different indicators of good management decreased in spring-burned plots, while the odds for the two indicators of poor management increased. There was no trend in the two indicators of excess nitrogen. Therefore, the conservation value of vegetation in spring-burned plots becomes reduced over time relative to traditional management.ConclusionsSpring burning is not an appropriate long-term management method if the aim is to maintain the conservation value of the vegetation in traditionally managed semi-natural grasslands.
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| 2. |
- Åkerblom Espeby, Liv, et al.
(författare)
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Variation in Elymus repens susceptibility to glyphosate
- 2014
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Ingår i: Acta Agriculturae Scandinavica - Section B. - : Taylor & Francis. - 0906-4710 .- 1651-1913. ; 64:3, s. 211-219
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Tidskriftsartikel (refereegranskat)abstract
- Continuous increase in glyphosate use in Sweden has caused concern about resistance development, not least inconnection with the possible introduction of crops resistant to glyphosate. In Sweden, the main weed targetedby glyphosate is Elymus repens (L.) Gould. We sampled 69 clones of E. repens to assess the magnitude andgeographical distribution of variation in susceptibility to glyphosate. Clones originated from four habitat types:intensively and extensively used arable lands, field vicinities and other habitats, including natural vegetation.Susceptibility varied greatly among clones with GR50 (50% of untreated growth reduction) spanning over atleast one order of magnitude, 17–278 active ingredient ha−1 in a pot experiment setting. There was a strongcovariance between geographic and genetic distance, but there was no evidence of geographic or geneticdifferentiation in GR50. Nor did GR50 vary consistently between habitat types. We conclude that no indicationof past selection was found towards the resistance to glyphosate in E. repens clones in Sweden. The greatvariability in susceptibility suggests that there might be a potential for such selection.
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